Abstract
The aim of this study was to identify different alien fish species introduced in the Mbô Floodplain (MF) Rivers in Cameroon and to study their life-history traits. For this purpose, a total number of 237 fishes with a total length (TL) of 24.50 ± 5.97 cm and total weight of 199.50 ± 106.78 g collected by traditional fishing gears were used for taxonomic identification. Four species grouped into three families were identified: Clariidae (Clarias gariepinus), Cichlidae (Oreochromis niloticus and Tilapia cameronensis), and Channidae (Parachanna obscura). There are two types of fish introduction: accidental introduction and intentional transfer. All fish species collected and examined were of large sizes (TL > 25 cm). The regression coefficient b of the length-weight relationship ranged from 3.00 (C. gariepinus) to 3.37 (T. cameronensis) (3.18 ± 0.17). Fish species showed a monthly and seasonal fluctuation in abundance in number of individuals. Alien fish species in the Mbô Floodplain showed two types of somatic growth: isometric and positive allometric. 75% of overall alien fish species were established and they recorded a mean K factor of 0.70 ± 0.40. Only 25.00% of the sampled species had more females than males.
Highlights
An alien species or alien genotype is a species, subspecies, or lower taxon occurring as a result of human action in an area or ecosystem in which it is not native [1]
Fish Species Introduced in the Mbo Floodplain
Four species belonging to three families were identified (Table 1): Clarias gariepinus (Clariidae), Oreochromis niloticus and Tilapia cameronensis (Cichlidae), and Parachanna obscura (Channidae)
Summary
An alien species or alien genotype is a species, subspecies, or lower taxon occurring as a result of human action in an area or ecosystem in which it is not native [1]. Introduced species concern any population, species, or race intentionally or accidentally transported and released by man into an environment outside its native range [2,3,4,5,6]. The uses of exotic fish species to control unwanted aquatic organisms were concerned principally with the attempted eradication of mosquito larvae. The introduction of molluskivorous (Astatoreochromis alluaudi) fishes has been proposed for controlling the aquatic snail vector of Schistosomiasis (bilharzia) [17]. Other fish species such as Mylopharyngodon piceus and more recently Heterotis
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